EXPLANATION OF PLATES. 357 



TAii. XI. 



Figs. 1, 2. Moina rectirostris, male and female. 



1 a. Auteiiuule of male 



3. Daphnia ])ulex ; var. magna, female. 



4, 5. Male of do. 



Fig. 4 represents the male in a very yonug state, previous to its 

 final moulting, and before it assumes its perfect form. 

 5 a. Antennule of male. 



Tab. XII. 



Fig. 1. Daplmia reticulata, male. 



a. Antennule. h. One of the lii'st pair of feet. 



2. D. reticulata ; var. ([uadrangula. 



3. Sida crystallina, female. 



Fig. A. Head magnified, in profile, b. Antennule c. Eye. 

 e. Stomach, f. Mandible, g. Labrum. q. Organs by 

 which the aninud attaches itself to objects, r. Heart. 



Fig. B. Eye magnified, to show the disposition of the crystallines 

 or facets. 



4. 8ida crystcdliyia, young. 



Tab. XIII. 



Fig. 1. Sida crystalUna. 



a. Antennule. b. Large antenna or ramus, c. Mandible. </. One 

 of the first pair of feet, e, f. Fourth pair of feet. y. Sixth 

 pair of feet. Ii. Abdomen. 



Tab. XIV. 



Fig. 1. DapJmella Wingii, female. 



3. Do. supine. 



4. Head of do. highly magnified. 



a. Stomach, b. Antennule. c. Eye. f. Mandible, g. Labruui. 

 i. Heart, o. (Esophagus. 



2. I). Wingii, male. 



a. Antennule. b. Abdomen. 



